CAS 10025-73-7 Chromium(III) chloride - Materials / Alfa Chemistry

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Chromium(III) chloride

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Catalog Number

ACM10025737

Product Name

Chromium(III) chloride

Structure

CAS

10025-73-7

Category

Electrolytes

Synonyms

Chromium(III) trichloride

IUPAC Name

Trichlorochromium

Molecular Weight

158.35

Molecular Formula

CrCl3

Canonical SMILES

Cl[Cr](Cl)Cl

InChI

InChI=1S/3ClH.Cr/h3*1H;/q;+3/p-3

InChI Key

QSWDMMVNRMROPK-UHFFFAOYSA-K

Boiling Point

1300 °C

Melting Point

1152 °C

Purity

99%+

Density

2.87 g/mL at 25 °C (lit.)

Solubility

Insoluble in water

Appearance

Violet flakes

Application

Chromium(III) chloride at elevated termperatures decomposes to chromium( II) chloride and chlorine:

2CrCl3→2CrCl2 + Cl2

Heating with excess chlorine produces vapors of chromium(IV) chloride, CrCl4. The tetrahedral tetrachloride is unstable, and occurs only in vapor phase.

When heated with hydrogen, it is reduced to chromium(II) chloride with the formation of hydrogen chloride:

2CrCl3 + H2→2CrCl2 + 2HCl

Chromium(III) chloride has very low solubility in pure water. However, it readily dissolves in the presence of Cr2+ ion. Reducing agents such as SnCl2 can "solubilize" CrCl3 in water. It forms adducts with many donor ligands. For example, with tetrahydrofuran (THF) in the presence of zinc, it forms the violet crystals of the complex CrCl3•3THF.

Storage

Store below +30 °C

Color/Form

Violet, lustrous, hexagonal, crystalline scales;Red-violet crystals;Bright purple plates;

Complexity

Covalently-Bonded Unit Count

EC Number

256-852-0

Exact Mass

156.847063

Heavy Atom Count

ICSC Number

1316

MDL Number

MFCD00010948

Monoisotopic Mass

156.847063

Other Experimental

Produces violet (dilute) or green (concentrated) acid solutions;Greasy feel; also exists in hygroscopic, soluble, peach-blossom colored form;Greenish-black or violet deliquescent crystals, depending on whether chlorine is coordinated with the chromium. Density: 1.76; MP: 83 deg C. Soluble in water and alcohol; insoluble in ether /Chromium chloride hexahydrate/;pH = 2.61 at 20 deg C at a concentration of 50/g/L /Chromium chloride hexahydrate/;Chromium forms a number of compounds in various oxidation states. Those of 2+ (chromous), 3+ (chromic) and 6+ (chromates) are the most important /Chromium, alloys and cmpd/;Cr(III) is the most stable oxidation state of chromium & is always present as a coordination complex /Trivalent chromium/;Slightly soluble in water. /Trivalent chromium/;

Trivalent chromium compounds are amphoteric;

RTECS Number

GB5425000

Stability

Stable under recommended storage conditions;Extremely unstable;

Topological Polar Surface Area

0 Å²

UNII

Z310X5O5RP

UN Number

1760

MSDS